Here is the full list of all 19 Bastard achievements.
Execute an adulterer
Allow bride-selling
Prohibit smiling
Drown a dandy
Exterminate the sodomites
Teach the rapist a lesson
Torture the miners
Go against the law
Punish an adulter
Burn the idol worshippers
Frighten an innkeeper and bootlegger
Defend a polyglot student
Convict a peasant in a debt
Hang the robber's brothers
Burn a witch
Protect the gardener
Break the rules
Adhere to the rules
Win by the rules